Remove Token::MatchNt.

src/libsyntax/fold.rs

@@ -571,7 +571,6 @@ pub fn noop_fold_token<T: Folder>(t: token::Token, fld: &mut T) -> token::Token
             token::Interpolated(Rc::new(fld.fold_interpolated(nt)))
         }
         token::SubstNt(ident) => token::SubstNt(fld.fold_ident(ident)),
-        token::MatchNt(name, kind) => token::MatchNt(fld.fold_ident(name), fld.fold_ident(kind)),
         _ => t
     }
 }